Oskarsdottir SE, et al. - Experts sought to predict undetected glaucoma in a predominantly white population, based on intraocular pressure (IOP) and subject age. A model to estimate the combined effect of IOP and age on the likelihood of undetected glaucoma was created and tested on 22,218 women and 11,700 men. Case-finding in European-derived populations may be facilitated by the model. IOP ≤ 21 mmHg was seen in a large proportion of subjects with undetected glaucoma, despite the important impact of IOP on the risk of glaucoma. With increasing IOP and older age, exponential increase in the proportion of subjects with glaucoma was seen.